package cn.wolfcode.util;

import cn.wolfcode.domain.Employee;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpSession;
import java.util.List;

public  class UserContext {
    private static final String EMPLOYEE_IN_SESSION = "EMPLOYEE_IN_SESSION";
    private static final String EXPRESSION_IN_SESSION = "EXPRESSION_IN_SESSION";
  //获取session对象
    public static HttpSession getSession(){
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes)
                RequestContextHolder.getRequestAttributes();
        return requestAttributes.getRequest().getSession();

    }
    //往session存入登录用户
    public static void setCurrentUser(Employee employee){
        getSession().setAttribute(EMPLOYEE_IN_SESSION,employee);

    }
    //从session获取登录用户
    public static Employee getCurrentUser(){
        return (Employee) getSession().getAttribute(EMPLOYEE_IN_SESSION);
    }
    //往session存入登录用户的权限信息
    public static void setExpression(List<String> permissions){
        getSession().setAttribute(EXPRESSION_IN_SESSION,permissions);
    }
    ////从session获取登录用户的权限信息
    public static List<String> getExpression(){
        return (List<String>) getSession().getAttribute(EXPRESSION_IN_SESSION);
    }


}
